Automatic gas cut-off.



R. A. MACK.

AUTOMATIC GAS GUT-OFF.

APPLIUATION FILED PEB. z3, 1912.

Patented May 28, 1912.

ww y .Il llllll IJ :15. v. W y l n 25kg/21h77] Gnome?,

r ToY all 'whom t may concern. i i' zo i drawings, in 'which- I be' screwed onto a gas supply pipe 3. The

vcitizen of the United' States, residing at Gal- `whereby the accidental escape of gas resulting associated with the valve to then prevent position; and Fig.l 2 is a vertical sectional describing my invention, a device construct'-l -bular member oricasing RUDLPH A.. MACK, OF GALLIPOLIS, CHIS).

Aiiroiaaric eas cur-OFF;

message Specicetion of Letters Patent.'

Patented May 28,1912.

4.Application led February 23, 1912. *Serial No. 679,473.

Be it known that I, RUDOLPH A. MACK, a

lipolis, in thecounty of Gallia and State of Ohio, have invented certain new and useful Improvements in Automatic Gas Cut0f`fs,

This invention relates toautomatic gas cut-offs, its primary .object'being'to provide a deviceY applicable to gas` service pipes ing from decrease of tually prevented. l

As is well known, the pressure of gas Sup? vplied to buildings is 'subject to fluctuation pressure may be effecati times becomes so weak as to extinguish lany burners which may have been in use the gas again becoming normal is thus pcrmitted to escape with the disastrous results 0f explosions, asphyxiation, and other dangers. It is to prevent circumstances of this nature that I have designed my invention, wherein a valve normally held in operative posit-ion by normal pressure of the gas, operates to c ut offthesupply when said pressure becomes weakened or reduced, locking means belany likelihood of flow of the gas until released by external agency cognizant of the cause of the failure hereinbefore described.

For a full understanding` of the present invention, reference is to be had to the folloi'ving description and the accompanying Figure l aview` in elevation of my device, a portion of the casing beingbroken away to show the 1valve in vits inoperative view, showing the valve in the position assumed thereby when the gas pressure is normal.

Throughout the following detail description and onA the several figures of the drawings,siinilar partsare referred'to by like reference characters.

- Referring to the drawings and speciically ed in accordance therewithcomprises a tul, open at its opposite ends, and into the lower opening thereofl is screwed a coupling 2, which is adaptedsto casing 1 is vertically disposed and is provided at its opposite end witha closure or cap l screwed thereinto and formed with a tubular guide member 5 extending withini` the casing l, said. guide member being also adapted to act as a stop, as willbe hereinafter more fully described. "At oneside of the casingl is provided an outlet G and mounted within the casing, for vertical movement, is an inverted cup shaped valve 7.

The coupling Q is formed with an integral hollow-tube S extending'a suit-able distance into the casing l and through which the gas from the supply pipe 3 passes, exerting a pressure against the valve 7 whieli'is airranged over said hollow tubular extension.

Then the pressure of the gas 1n the pipe 3 is normal, the valve T assumes its upper raised position, shown in full lines in Fig.

2 of the drawings, said upward movement being limited by the stop 5. "when, however., the pressure of the gas, for any reason, becomes weakened lthe valve 7 descends over the tubular extension 8 until the 'lower sides of t-he valve 7 are immersed in the liquid designated at 9, said liquid being preferably mercury. Adjacentthe lower portion of the sides of the-valve 7 are provided a plurality of openings lOVthrough which the gas passes Iinto the casing l when said valve is in its normal position. So long as said valve is at its upward position, the gas is permitted to flow through the outlet '6, as customary, which outlet may be connected either above or below the g. s meter.

By the provision of the openings l0 in the valve 7,'it is possible' for said valve to pei-- mit the flow of the gas through the outlet l6 notwithstanding that the lower end of the valve is immersed `in the sealing fluid shown at 9. The above arrangement affords an advantage in that the mechanism of the invention is rendered more sensitive, there being no tendency on the part of the liquid ,9 to resist the initial lowering movement of the valve when the pressure thereagainst is relieved, as hereinafter more' fully referred to.

- Thel reciprocating movements of the valve are preferably guided by means of a rod ll extending upwardly from the top of thc valve 7 and into the tubular guide member 5.V It will be evident, however, that said rod 11 may be dispensed with without in any way alfectingv the,l operation of my device.

To prevent the valve 7 from ,movement which will permit the gas to escape after thepressure has been reduced, I providel a Q i nesso-ie locking lever l2 pivotnlly'mounted in a hollow extension 'i3 of theeasing l. its will he evident, when the valve passes the eittremiti7 ol the lever 1Q, said lever will engogo over the top portion of the valve and prevent upward movement thereof. The lever 12 is 'formed with an integral arm 12, against 'which a heeded pin lfl, having mounted thereon the. spring 15, projeets, the

l tendent-.y of the spring l5 being to hold the pin retracted.

The hollow extension i3 muy he said to be of somewhat inverted L-torin in cross section and sineethe pressure pin l-'t is nor- 15 mally held'relrufted, the nrln l2 ot the 'll constitutes a .stop to resist any tendenoy of the valve to return to its normal po ion. Under these eouditions, the pin lflperforms et dual funetionin a nianner whieh will he readily evident; liv reason olt the location of the hollow nieuiher 'i3 nt one side ot the easing l., ity will he apparent that` the internal parts ot the deviee may he readilv removed vv'itlunlt interl'erein'e with the lool(- ing menus described and comprising; the,

tllports l2, liind l5.

ln order that the valve ma)Y heeoine unerf utive it'l only necessary to press the pin il inwardly to diseneau'e the lever 1;) troni the valve i', whu'h will uninedit-ilei'v assnineits:

upper position it the pressure ot gras is noi-unil.

As will he apparent, elntnges may he made in the 'l'orni ot roustruetion ot" in v deviee without departing*r troin the spirit' of the 40 invention and within the scope ot' the elninis hereto appended.

-lluvine thus deserihed the invention, wlntt is elaiined :is new is:

l. n ant'oniatie gas rut-oill eonnlnisine o l5 easing,y having :in outlet lending' theret'ronn :L elosiire tor one end ot the easing1 pro-- vided with a hollow extenslon ',noieetine into the enf-'ing' some distanee. n valve. treely inovahle in the easing` and, ndnpted to reeeive therein snid hollow extension, n` liquid Contained in the Casing and adapted to establish a lutunl yseal hetween the vulve und said hollow extension, sind easing being provided with a hollow extension projecting troni one side of the same, a' lever mounted insaid hollow extension and having one end arranged to engage over the valve to lool; the some from movement, Said lever havingI an' arm at its other end extending outwardly into the'last mentioned hollow extension, n pressure pin cnrriedloy the last mentioned hollow extension and arranged to engage the arm aforesaid to release. the valve, from the lever, and means Coperatingn with the pin to hold the latter in a retracted position, permitting slight movement of the le`ver toassume a locking position in respect to the vulve, seid pin further constituting n stop to prevent', a releasing` movement of the lever in respect to the vulve after the latter hes once become loolmtl.

2. )in automatic gos eut-ott', the same compri-,ting o hollow easing, a closure et the lower end ot' said easing having :i tubular extension 1,nojeeting upwardly therefrom, :L hollow vulve. mounted `in the easing ond :idaiitfed 'to retfeive said extension therein, 'said easing having; en outlet above the valve and heineitorined at; one side with :i hollow' exten-:ion projecting therefrom and of sinnewlmt Ltorm in eross section, zt looking lever pivoted in the hist mentioned hol.- low extension und having' one end adopted to eng-.rune over the vnlve to lock the sumo `troni movement when the valve assumes un ahnorinal position, said lever having an arm 'proieeting outwardly into the outermostportion olE the lost mentioned hollow extension, o pressure pin mounted on the hollow extension uloresnid with its inner end :ir-

i ranged. to engage the arm to press the saine upwardly and thus release the valve, and n spring eotiperating to hold the pressure pin rettet-ted :it the outer limit oiits movement' and in o `position permitting o slight movement of the loelt'ing'lever to assume n looking` lposition' end to t'orm it stop preventing movente/rit ot the looking lever after it has once loeliingly engaged the vulve.

ln testimony whereof l otlix my signature in presence ol" two Witnesses.

. RUDGLPH'A. MiiGK. l `ilitnesses: 'I

leeren Ch ineens, FRANK El. GATES. 

